The ghome-disks utility can also be used to start and mount this. Since it is /dev/mmc and not /dev/sd, the system will probably have it assumed to be system owned, and will mount under root ownership only.

You can follow the above, but will then have to do a lot of crap with permissions to the mount. If it were or is a fixed mount and not the automount /media mechanism one can do that once. However it will be reset on every mount and be inconvenient.

Solution might be to use gnome-disks. That has a problem however. The FUSE exfat driver and the above asset is root owned. Gnome-disks will not access and mount it due to the system ownership problem

So use a utility to run gnome kit stuff from a command line as su root.

apt-get -y install gksu

installs the gksudo and other stuff.

gksudo gnome-disks will mount the device and make it properly available.

Note that sudo gnome-disks makes the thing root owned again, since you are running as root user in the desktop. gksudo will run as root, but effectivly as the user desktop user id.